EXPLANATION OF PLATES. 



PLflTE 15. PAGE 



FAVOSITES CLAVATULUS, N. Sp. 41 



FIGS. 1-2. — Lateral views, with a portion of the walls 

 of the tubes broken away, showing the large 

 pores. 



FIG. 3. — Lateral view of another example. 



FAVOSITES ROTUNDUS, N. Sp. 41 



FIG. 4. — Ventral view, with a portion of upper sur- 

 face worn away, showing the fissiparous mode 

 of growth. 



FIG. 5. — Basal view, of another specimen, showing 

 the strong wrinkled epithical crust. 



FIG. 6. — Ventral view of another individual. 



ZAPHRENTIS BREVICORNIS, N. Sp. 37 



FIG. 7. — Posterior view, showing the interior of the 



calix. 

 F I Q . 8. — Lateral view, of another specimen. 



ZAPHRENTIS ALBERSI, N. Sp. 38 



FIG. 9. — Posterior view. 



FIG. 10. — Calix view, of another specimen. 



FIG. 11. — Lateral view, of another example. 



